body {
  margin: 0;
  padding: 0;
  background-color: #25292d;
  header {
    margin: 0;
    height: 73px;
    width: 100%;
    position: relative;
    border-bottom: 1px solid #666;
    a {
      display: block;
      &:nth-child(1) {
        margin: 9px 20px;
      }
      &:nth-child(2) {
        position: absolute;
        margin: 0 auto;
        left: 50%;
        top: -9px;
        transform: translateX(-50%);
      }
    }
  }
  nav {
    // margin-top: -16px;
    ul {
      margin: 0;
      padding: 0;
      list-style: none;
      width: 100%;
      height: 78px;
      line-height: 78px;
      li {
        float: left;
        width: 25%;
        text-align: center;
        a {
          display: block;
          text-decoration: none;
          font: 400 25px;
          color: #666;
          &:hover {
            color: #fff;
            font-size: 30px;
            border-bottom: 3px solid #9579db;
          }
        }
        &:nth-child(1) {
          color: #fff;
          font-size: 30px;
          border-bottom: 3px solid #9579db;
        }
      }
      &::after {
        content: "";
        clear: both;
      }
    }
  }
  .main {
    margin-top: 3px;
    width: 100%;
    background-color: #1e2125;
    padding-bottom: 90px;
    .main-header {
      height: 108px;
      line-height: 108px;
      padding: 0 20px;
      display: flex;
      justify-content: space-between;
      flex-wrap: nowrap;
      .main-h-l {
        position: relative;
        .circle {
          display: inline-block;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
          width: 60px;
          height: 60px;
          background-color: #25292d;
          border-radius: 50%;
        }
        span {
          padding-left: 62px;
          font-weight: 500;
          font-size: 20px;
          color: #fff;
        }
        &::after {
          content: "";
          clear: both;
        }
      }
      .main-h-r {
        position: relative;
        span {
          color: #666;
          font-size: 15px;
          padding-right: 122px;
        }
        img {
          position: absolute;
          right: 0;
          top: 50%;
          transform: translateY(-50%);
        }
        &::after {
          content: "";
          clear: both;
        }
      }
    }
    .main-body {
      .main-b-item {
        height: 580px;
        background: url(./切片图片/main_1.jpg) no-repeat;
        background-size: cover;
        text-align: center;
        // margin-top: 220px;
        color: #fff;
        h1 {
          margin: 0;
          padding: 0;
          padding-top: 250px;
        }
        .button {
          margin: 0 auto;
          background-color: #323241;
          width: 200px;
          height: 60px;
          border-radius: 30px;
          text-align: center;
          line-height: 60px;
          font-size: 20px;
          &:hover {
            background-color: #fff;
            color: #000;
          }
        }
        &:nth-of-type(2) {
          background: url(./切片图片/main_2.jpg) no-repeat;
          background-size: cover;
        }
        &:nth-of-type(3) {
          background: url(./切片图片/main_3.jpg) no-repeat;
          background-size: cover;
        }
        &:nth-of-type(4) {
          background: url(./切片图片/main_4.jpg) no-repeat;
          background-size: cover;
        }
      }
    }
  }
  footer {
    // padding: 0 46px;
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 90px;
    line-height: 90px;
    background-color: #25292d;
    ul {
      width: 100%;
      margin: 0 20px;
      padding: 0;
      list-style: none;
      display: flex;
      justify-content: space-between;
      flex-wrap: nowrap;
      li {
        width: 20%;
        a {
          display: inline-block;
        }
        &:hover {
          background-color: #000;
        }
      }
    }
  }
}
